Yupe, bro weikee correct, inverter copper piping is much thicker as compared to non-inverter. Unless your copper pipe is concealed, if not concealed one, you can change anytime in future. The A/C ppl told me conceal the drain pipe only, copper pipe can hide without conceal (according to some house structure, can hide nicely) as in the case of any problem, easier to troubleshoot.

Regarding the wiring, I didnt know Sharp has secondary control signal until I saw weikee's post, did you ask the sharp fella that secondary one used to control what?

Not sure, but is good to pull 5 wires. Won't cost much. Another method i learn from the A/C installer is use the earth wire as secondary controller wire, and use the copper pipe as Ground. So 4 wire is possible to use Sharp too.

Herm, copper pipe as ground ar? In the case of any gas leakage, then it will be troublesome lor?

Nope, cause wires also made of copper. But you plan to use inverter, just put 5 wires better.

Not same wiring.

You need minimal 4 wires.
1 - Live
1 - Neutral
1 - Ground
1 - Control signal
1 - Control Signal secondary.

Some need 5 wires. Best is get 5 wires. My Panasonic need 4 wires, when i ask for Sharp, it need 5 Wires.

So best put 5. And if possible use all Inverter copper piping future to change A/C is much easier. I did a mistake by saving only RM 500+-, Should have use all Inverter piping. 10 Years later maybe hard to get non inverter, and got to redo piping.

Damn...I been told that Inverter / Non inverter copper cant be mixed, hence I didn't install Inverter version....but from above Inverter piping can use by Non Inverter???
If true...too late

Want to ask are non-inverter and inverter aircond using Same piping and wiring? Thx

Want to ask about the air con setup for 20x70 living and dining hall.
Usually how is the setup?

2hp in living and 1.5hp in dining enough?
Or 1 2.5hp in living only? but can dining get the cool air?

I need some advice here. Appreciate anyone can share their current setup.
Thanks.

20x70 living and dinning hall is very big, you need lots of A/C

Sorry, let me do some correction. The 20x70 is the size for the entire house.
The built up area for living and dining area is 20x26 (including staircase) and dry kitchen area is 9x6

How should I place my air cons?

i dont think people will pay high for the inverter piping and use it for non inverter series aircond. if there is, it is only a small group of customers (price doesnt matter) would do so.

It will also depends on what is the temperature you are expecting form the AC. You have a staircase, which I presume is open to the upper floor. Thus source for cold air to escape. Unless your living & dining areas are enclosed, it will be difficult to achieve a very low temp.

Thanks for replying, normally i set the temp to 23 or 24 degrees C. Since this is my 1st landed DSL House, therefore i would like to know from other forummer what is the usually placement for air con in ground floor and what is the needed horse power.

Thanks again.

For my case, I place the both the AC units at both ends of the living & dining.

It will also depends on what is the temperature you are expecting form the AC. You have a staircase, which I presume is open to the upper floor. Thus source for cold air to escape. Unless your living & dining areas are enclosed, it will be difficult to achieve a very low temp.

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Added on November 16, 2011, 9:02 am

The cost for the inverter copper piping is not very much from the non-inverter ones. Considering this over the total renovation cost and the need to hack and replace the piping if sometime down the road, you decides otherwise.

I use 2hp for my living hall, 1hp for dining area (with dry kitchen).

My living hall is about 21 x 16, dining area  11x 20

For me is not really cold, just enough to make it only. If I have the cash, I'll go for 3 x 2hp.